Rainfall missing-gauge estimate calculator

Calculate normal-ratio missing rainfall estimate with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use normal-ratio missing rainfall estimate to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Neighbor observed rainfall (mm)
25,30,20
Neighbor normal annual rainfall (mm)
800,1000,900
Missing station normal annual rainfall (mm)
950
Normal-ratio missing rainfall estimate (mm)
26.43287

Try another scenario

Neighbor observed rainfall (mm)
[26, 30, 20]
Neighbor normal annual rainfall (mm)
[800, 1000, 900]
Missing station normal annual rainfall (mm)
950
Normal-ratio missing rainfall estimate (mm)
26.828704
Calculation method

Calculation method

Normal-ratio missing rainfall estimate (mm)

Normal-ratio estimate: average of neighbor observed precipitation × target normal/neighbor normal.

Symbols and units
a
Neighbor observed rainfall (mm)
b
Neighbor normal annual rainfall (mm)
c
Missing station normal annual rainfall (mm)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Normal-ratio estimate: average of neighbor observed precipitation × target normal/neighbor normal. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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